Sideboard



FIG. 1 is a front perspective view of a sideboard showing my new design;

FIG. 2 is a side elevation view, the opposite side being a mirror image thereof;

FIG. 3 is a front elevation view thereof;

FIG. 4 is top view thereof;

FIG. 5 is an enlarged partial top, left perspective view; and,

FIG. 6 is an enlarged partial bottom, left corner and leg perspective view thereof.

The bottom and rear views (not shown) form no part of the claimed design.

The broken line showing of environmental elements is for illustrative purposes only and forms no part of the claimed design. 

The ornamental design for a sideboard, as shown and descibed. 